The Bitmap file format is a relatively simple and straight forward way to store and represent raster graphics, in a wide variety of different ways, usually as uncompressed data. The simplicity of the format makes it quite easy to use (and especialy write), which is why it is favored by some software and libraries, though the store the data from bottom-to-top, left-to-right.
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The ICO file format is a rather simple file format primarily used for icons in Windows. An icon file can contain several images of various sizes, formats, and color depths to ensure maximum compatibility for all supported platforms and contexts. ICO (from here on icon) files are primarily used for application and file icons in windows, website icons or windows cursors (in the form of the CUR file format, which is identical to the icon file format).
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